Having problems with my gas dryer. Over the last several months intermittent control problems. Currently the display is showing error code "PF" or no display at all when plugged in. When the display does come on none of the other control buttons respond. According to the manual, push and hold the "start" button is supposed to reset the control. This doesn't work. After unplugging several time, occassional I can get the unit to start, but not able to change cycle. I was going to replace the "user interface assy" but the problem could also be the "machine control bd". I am not sure how to determine which? Additionally, I did see one blog the mentioned cleaning the micro contacts to fix the problem. Is that another possible solution? Pls advise. Thx

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